<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="./lib/vue.min-2.6.11.js"></script>

</head>
<body>
    <div id="app">
        <input type="button" value="浪起来" v-on:click="lang">
        <input type="button" value="别浪" v-on:click="stop"> 

        <h3 v-text="msg"></h3>

    </div>
    <script>
    const vm = new Vue({
        el:"#app",
        data: {
            msg:'猥琐发育 别浪~~~~~~~~~~~~~~~~~~~!',
            intervalId :null
        },
        methods: {
            lang: function(){
                if(this.intervalId !=null) return

                const that = this

                this.intervalId = setInterval(function(){
                    const start = that.msg.substring(0,1)
                    const end = that.msg.substring(1)
                    that.msg = end + start
                },200)
            },
            stop: function(){
                clearInterval(this.intervalId)
                this.intervalId = null
            }

            
        }
    })
    </script>
    
</body>
</html>